Duke 957R User manual

H.C. Duke & Son, Inc. P/N 184662 August 1999 Printed in U.S.A.
OPERATOR'S MANUAL
with ILLUSTRATED PARTS LIST
TWIN TWIST
SOFT SERVE FREEZER
MODEL 957R
184662 - 8/99

i
DUKE Model 957R Soft Serve Freezer
All contents © Copyright 1999 H.C. Duke & Son, Inc., 2116 Eighth Avenue, East Moline, Illinois 61244
i
Operator’s Manual
for the
Soft Serve Twist Freezer
Model 957R

ii
DUKE Model 957R Soft Serve Freezer
SAFETY FIRST!
Follow these four steps to safety ....
WARNING
DANGER
DANGER
Whenyouseethissymbolonyour957Rorinthis
manual,bealert to the potentialforpersonalinjury.
Followrecommendedprecautions and safeoperating
practices.
The signal words — DANGER, WARNING and CAU-
TION — areused withthe safetyalert symbol.(DAN-
GERdecals on the freezer may ormay not have the
safetyalertsymbol,but the message is the same.)
Decals with the words DANGER, WARNING, or CAU-
TIONappearonthe957R. DANGER identifies the
mostserioushazard.Decalswith the words DANGER
orWARNINGaretypicallynearspecifichazardson
the957R.Generalprecautions are listed onCAUTION
safetydecals.
Inthismanual, CAUTION messages withthesafety
alert symbol call attention to safety messages.
CAUTION
1. Recognize Safety Information ....Look for this
safety alert symbol throughout this manual.
2. Understand Signal Words ....

iii
DUKE Model 957R Soft Serve Freezer
SAFETY FIRST!
3. Follow Safety Instructions ....
4. Operate Safely ....
Readandunderstandall safety messages in this
manualandonyour957R.Take notice of the location
of all decals on the 957R and keep the safety decals
ingoodcondition. Check them periodicallyandre-
placemissing,damaged, or illegiblesafetydecals.
Thesafetydecalsmustremain in place and legible for
the life of the 957R. If you need new decals, use the
informationandillustrationsonpagesivand v of this
manualtoidentifythedecalandcallorwritetoH.C.
Duke&Son,Inc.
DO NOT attempttooperatethe957RTwinTwist Soft
ServeFreezeruntilyou read and understand all safety
messagesandthe operatinginstructionsinthis
manual.
DO NOT allowuntrainedpersonneltomaintain
and/orservicethismachine. Failure to follow this
instructionmayresult in severepersonalinjury.
DO NOT operatethe957Runtilallserviceand
accesscoversaresecuredwithscrews.DO NOT
attempttorepairor maintain the 957R untilthe
mainpowersupply hasbeendisconnected.Some
freezershavemorethan one disconnect switch.
ContactyourIDQ authorized servicerepresenta-
tiveorH.C.Duke&Son,Inc.ServiceDepartment
fororiginalequipment parts.

iv
DUKE Model 957R Soft Serve Freezer
1p/n 165025 Decal—Beater Warning (1)
2p/n 165126 Decal—Panel Removal Warning (3)
Do not attempt to operate the freezer
until all safety precautions and operating
instructions in this manual are read and
understood.
Take notice of all warning, caution,
instruction and information decals (or
labels) on the freezer as shown in the
figure on the next page. The labels have
been put there to help maintain a safe
working environment.
The labels have been designed to
withstand washing and cleaning. All
labels must remain legible for the life of
the freezer. Labels should be checked
periodically to be sure they can be
recognized as warning labels.
If it is necessary to replace any label,
please contact International Dairy Queen
(IDQ), Inc. When ready to order you will
need to determine the (1) part number,
(2) type of label, (3) location of label, and
(4) quantity required, and include a return
shipping address.
You may contact IDQ as follows:
International Dairy Queen, Inc.
P.O. Box 35286
Minneapolis, Minnesota 55437
[phone]
or — for factory service assistance —
contact H. C. Duke & Son, Inc., Service
Department by phone or FAX:
Phone: [phone]
or [phone]
FAX: [phone]
(The decals on the next page are num-
bered 1 and 2. Those numbers corre-
spond to the numbers in the table below.
The table provides the part number,
description, and quantity for each decal.)
Safety Decal Locations

No. Part No. Description (Qty.)

v
DUKE Model 957R Soft Serve Freezer
Safety Decal Locations
WARNING
!
Hazardous moving parts.
Machine starts automatically.
Do not operate with panel
removed.
P/N 165126
P/N 165025
1
Before removing dispense head:
1. Turn all control switches to "OFF", and
2. Disconnect all power supplies. Unit may
have more than one power supply.
Hazardous rotating beater shaft. Do not
operate unit with dispense head removed
.
2

vi
DUKE Model 957R Soft Serve Freezer
TT
TT
TABLE OF CONTENTSABLE OF CONTENTS
ABLE OF CONTENTSABLE OF CONTENTS
ABLE OF CONTENTS
SAFETYSAFETY
SAFETYSAFETY
SAFETY ............................................................................................................................................................................................................................
............................................................................................................................................................................................................................
.............................................................................................................. ii
ii
i
SAFETY DECAL LOCATIONSSAFETY DECAL LOCATIONS
SAFETY DECAL LOCATIONSSAFETY DECAL LOCATIONS
SAFETY DECAL LOCATIONS ..........................................................................................................................................................
..........................................................................................................................................................
............................................................................. iviv
iviv
iv
PP
PP
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11
11
1INTRODUCTIONINTRODUCTION
INTRODUCTIONINTRODUCTION
INTRODUCTION ............................................................................................................................................................................
............................................................................................................................................................................
...................................................................................... 11
11
1
22
22
2NOTE TO INSTALLERNOTE TO INSTALLER
NOTE TO INSTALLERNOTE TO INSTALLER
NOTE TO INSTALLER ............................................................................................................................................................
............................................................................................................................................................
.............................................................................. 11
11
1
2.1 Uncrating and Inspection2.1 Uncrating and Inspection
2.1 Uncrating and Inspection2.1 Uncrating and Inspection
2.1 Uncrating and Inspection ....................................................................................................................................
....................................................................................................................................
.................................................................. 11
11
1
2.2 Installation2.2 Installation
2.2 Installation2.2 Installation
2.2 Installation ................................................................................................................................................................................
................................................................................................................................................................................
........................................................................................ 22
22
2
2.3ElectricalRequirements2.3ElectricalRequirements
2.3ElectricalRequirements2.3ElectricalRequirements
2.3ElectricalRequirements ..............................................................................................................................................
..............................................................................................................................................
.......................................................................33
33
3
2.4 Electrical Connections2.4 Electrical Connections
2.4 Electrical Connections2.4 Electrical Connections
2.4 Electrical Connections ..................................................................................................................................................
..................................................................................................................................................
.........................................................................33
33
3
33
33
3SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS ............................................................................................................................................................................
............................................................................................................................................................................
......................................................................................44
44
4
3.1Particulars3.1Particulars
3.1Particulars3.1Particulars
3.1 Particulars ......................................................................................................................................................................................
......................................................................................................................................................................................
...........................................................................................44
44
4
3.2 Dimensions3.2 Dimensions
3.2 Dimensions3.2 Dimensions
3.2 Dimensions ..................................................................................................................................................................................
..................................................................................................................................................................................
.........................................................................................44
44
4
3.3 Data Plate3.3 Data Plate
3.3 Data Plate3.3 Data Plate
3.3 Data Plate ........................................................................................................................................................................................
........................................................................................................................................................................................
............................................................................................44
44
4
44
44
4PART NAMES AND FUNCTIONSPART NAMES AND FUNCTIONS
PART NAMES AND FUNCTIONSPART NAMES AND FUNCTIONS
PART NAMES AND FUNCTIONS ................................................................................................................................
................................................................................................................................
................................................................66
66
6
55
55
5OPERATOR CONTROLSOPERATOR CONTROLS
OPERATOR CONTROLSOPERATOR CONTROLS
OPERATOR CONTROLS ........................................................................................................................................................
........................................................................................................................................................
............................................................................88
88
8
66
66
6DISASSEMBLY AND CLEANINGDISASSEMBLY AND CLEANING
DISASSEMBLY AND CLEANINGDISASSEMBLY AND CLEANING
DISASSEMBLY AND CLEANING ............................................................................................................................
............................................................................................................................
.............................................................. 1111
1111
11
6.1 Cleaning Accessories6.1 Cleaning Accessories
6.1 Cleaning Accessories6.1 Cleaning Accessories
6.1 Cleaning Accessories ................................................................................................................................................
................................................................................................................................................
........................................................................ 1212
1212
12
6.2 Disassembly Instructions6.2 Disassembly Instructions
6.2 Disassembly Instructions6.2 Disassembly Instructions
6.2 Disassembly Instructions ....................................................................................................................................
....................................................................................................................................
.................................................................. 1212
1212
12
6.3 Cleaning Instructions6.3 Cleaning Instructions
6.3 Cleaning Instructions6.3 Cleaning Instructions
6.3 Cleaning Instructions ................................................................................................................................................
................................................................................................................................................
........................................................................ 1414
1414
14
77
77
7ASSEMBLYASSEMBLY
ASSEMBLYASSEMBLY
ASSEMBLY ........................................................................................................................................................................................
........................................................................................................................................................................................
............................................................................................ 1717
1717
17

vii
DUKE Model 957R Soft Serve Freezer
88
88
8STARTUPINSTRUCTIONSSTARTUPINSTRUCTIONS
STARTUPINSTRUCTIONSSTARTUPINSTRUCTIONS
STARTUPINSTRUCTIONS ..............................................................................................................................................
..............................................................................................................................................
....................................................................... 1919
1919
19
8.1 Sanitizing8.1 Sanitizing
8.1 Sanitizing8.1 Sanitizing
8.1 Sanitizing ....................................................................................................................................................................................
....................................................................................................................................................................................
.......................................................................................... 1919
1919
19
8.2 Priming8.2 Priming
8.2 Priming8.2 Priming
8.2 Priming ..........................................................................................................................................................................................
..........................................................................................................................................................................................
............................................................................................. 2020
2020
20
8.3 Dispensing Product8.3 Dispensing Product
8.3 Dispensing Product8.3 Dispensing Product
8.3 Dispensing Product ......................................................................................................................................................
......................................................................................................................................................
........................................................................... 2222
2222
22
99
99
9CLOSINGPROCEDURESCLOSINGPROCEDURES
CLOSINGPROCEDURESCLOSINGPROCEDURES
CLOSINGPROCEDURES ..................................................................................................................................................
..................................................................................................................................................
......................................................................... 2323
2323
23
1010
1010
10 GENERAL INFORMATIONGENERAL INFORMATION
GENERAL INFORMATIONGENERAL INFORMATION
GENERAL INFORMATION................................................................................................................................................
................................................................................................................................................
........................................................................ 2424
2424
24
10.1 Dairy Queen Mix10.1 Dairy Queen Mix
10.1 Dairy Queen Mix10.1 Dairy Queen Mix
10.1 Dairy Queen Mix ............................................................................................................................................................
............................................................................................................................................................
.............................................................................. 2424
2424
24
10.2 Checking the Frozen DQ Product.10.2 Checking the Frozen DQ Product.
10.2 Checking the Frozen DQ Product.10.2 Checking the Frozen DQ Product.
10.2 Checking the Frozen DQ Product. ........................................................................................................
........................................................................................................
.................................................... 2424
2424
24
10.3ProductTemperature10.3ProductTemperature
10.3ProductTemperature10.3ProductTemperature
10.3ProductTemperature ..............................................................................................................................................
..............................................................................................................................................
....................................................................... 2525
2525
25
10.4Overrun10.4Overrun
10.4Overrun10.4Overrun
10.4Overrun ......................................................................................................................................................................................
......................................................................................................................................................................................
........................................................................................... 2525
2525
25
10.5 Overrun Adjustment10.5 Overrun Adjustment
10.5 Overrun Adjustment10.5 Overrun Adjustment
10.5 Overrun Adjustment ................................................................................................................................................
................................................................................................................................................
........................................................................ 2626
2626
26
10.6Rerun10.6Rerun
10.6Rerun10.6Rerun
10.6Rerun ............................................................................................................................................................................................
............................................................................................................................................................................................
.............................................................................................. 2626
2626
26
10.7OverrunChart10.7OverrunChart
10.7OverrunChart10.7OverrunChart
10.7OverrunChart ....................................................................................................................................................................
....................................................................................................................................................................
.................................................................................. 2727
2727
27
1111
1111
11 ROUTINEMAINTENANCEROUTINEMAINTENANCE
ROUTINEMAINTENANCEROUTINEMAINTENANCE
ROUTINEMAINTENANCE ................................................................................................................................................
................................................................................................................................................
........................................................................ 2828
2828
28
1212
1212
12 TROUBLESHOOTING TABLESTROUBLESHOOTING TABLES
TROUBLESHOOTING TABLESTROUBLESHOOTING TABLES
TROUBLESHOOTING TABLES..................................................................................................................................
..................................................................................................................................
................................................................. 3131
3131
31
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ART IIT II
T IIT II
T II
MODEL 957R REPLACEMENT PARTS w/ ILLUSTRATIONSMODEL 957R REPLACEMENT PARTS w/ ILLUSTRATIONS
MODEL 957R REPLACEMENT PARTS w/ ILLUSTRATIONSMODEL 957R REPLACEMENT PARTS w/ ILLUSTRATIONS
MODEL 957R REPLACEMENT PARTS w/ ILLUSTRATIONS............................................................................................
............................................................................................
.............................................. **
**
*
*Refer to Part II Table of Contents for help with locating part numbers and illustrations.

1
184662
DUKE Model 957R Soft Serve Freezer
2 Note to Installer
This freezer must be installed and serviced by an authorized service techni-
cian in accordance with the installation instructions.
1 Introduction
The 957R Freezer is designed to
produce DQ soft serve ice cream or
DQ frozen yogurt, with a product
serving temperature of 18 to 19ºF (-
8 to -7ºC). Use of other products in
this machine is considered misuse
(see Warranty.)
This manual has been prepared to
assist in the training of personnel
on the proper operation and gen-
eral maintenance of your Duke
freezer.
Your freezer will not compensate
for or correct any assembly or
priming errors made during the
initial start-up. Therefore, it is
extremely important to follow the
assembly and priming procedures
detailed in this manual.
Make sure all personnel respon-
sible for equipment operation
completely read and understand
this manual before operating the
freezer. When properly operated
and maintained, your freezer will
produce a consistent quality prod-
uct.
Name______________________
Address_____________________
____________________________
Phone_______________________
orH.C.Duke &Son,Inc.ServiceDept.for
factoryserviceassistance.
Phonenumber: [phone]
or [phone]
Faxnumber: [phone]
If you require technical assistance,
please contact your local authorized
H.C. Duke & Son, Inc. service com-
pany:


2184662
DUKE Model 957R Soft Serve Freezer
Figure2-1 MachineboltedtoShippingBase Figure2-2 InstallingMountingLegs
2.1 Uncrating and Inspection
CAUTION
Besuretoproperlysupport
themachinewhenremoving
boltsandinstallinglegsor
casters.
Whentheunitisreceivedandwhilethe
carrierisstillpresent, inspecttheshipping
cartonforanydamagethatmayhave
occurredintransit.Ifthecarton isbroken,
torn,orpunctured,notethedamageonthe
carrier’sfreightbillandnotifythecarrier’s
localagentimmediately.
1. Removethecartonfromthepallet,and
movethemachineascloseaspossible
tothepermanentlocation.
2. Removetheshippingboltsonthe
bottomofthefreezer(figure2-1)and
installeitherthelegsorcasters(figure2-
2).
CAUTION
Allmaterialsandconnectionsmust
conformtolocal requirementsand
beincompliancewiththe National
ElectricalCode(NEC).
1. Wherecodespermit,werecommend
thatyouinstallthefreezer oncasters
andhaveflexiblewaterandelectrical
connectionsforserviceandcleaning
ability.
2. Air-cooledmodelsrequireaminimum
6-inchclearanceontherearpanelfor
adequateventilation.
3. Watercooleddoubleheadmodels
requireaminimum6-inchclearance
ontherearpanelforadequate
ventilation.Water-cooledmodelswill
requirea1/2"MPTwaterinletand
waterwasteconnection.Both
condensersaretiedtogethersothat
onewaterinletandonewaterwaste
areallthatisrequired.Theconnec-
2.2 Installation

3
184662
DUKE Model 957R Soft Serve Freezer
2.2 Installation (continued)
tionsarefoundonthebackpaneland
areclearlytagged-“WaterInlet"and
"WaterWaste".Amanualshut-offvalve
shouldbeinstalledinthewaterinlet
lineatthe timeofinstallation.
4. Place thefreezerinthefinallocation
andlevelthemachinebyadjustingthe
legsorcasters sothat theunitis level
side-to-side,andthefrontisapproxi-
mately1/4"lowerthantherear.This
willallowproperdrainageofthe
freezingcylinder.
2.3 Electrical Requirements
2. Supplyvoltagemustbewithin+10%
ofvoltageindicatedonnameplate.
Also,onthree-phasesystems,voltage
betweenphasesmustbebalanced
within2%.(Morethana6voltdiffer-
encebetweenanytwovoltagemea-
surementsat208-230voltsindicatesa
possibleimbalance.)Requestlocal
powercompanytocorrectanyvoltage
problem.
3. Aneasilyaccessiblemainpower
disconnectmustbeprovidedforall
polesofthewiringtothefreezer.
2.4 Electrical Connections
CAUTION
To prevent accidental electrical
shock, a receptacle with a
positive earth ground is
required.
1. Double freezerswithtwocompressors
requireonepowersupplyforeachside
ofthefreezer.Eachsideofthefreezer
operatesindependently.
2. Check thedataplateforfuse size,
wireampacityandelectricalspecifica-
tions.
3. Refertothewiringdiagramprovidedfor
properpowerconnections.
CAUTION
To prevent accidental electrical
shock, a receptacle with a
positive earth ground is
required.
1. Alwaysverifyelectricalspecifications
onthedataplateofeachindividual
freezer.Dataplatespecificationswill
alwayssupersedetheinformationin
thismanual.
4. Electrical connectionsaremadeinthe
junctionbox(es)locatedmid-level
behindthebackpanel.
5. Usedualelementfuses,ratedat25%
overthefullloadamperage(FLA)
ratingofthefreezer.Refertothedata
plateontherearpanel.Asmentioned
before,alldoubleheadmachines
shouldbewiredandfusedasindi-
vidualunits.Useaflexibleconnection
whenpermissible.Allmaterialsand
connectionsmustconformtolocal
codesand/ortheNationalElectrical
Code.

4184662
DUKE Model 957R Soft Serve Freezer
3 Specifications
Always check and verify voltage and amperage on the data
plate located on the back panel of each freezer.
957R
Width-in./cm 16/40.6
Height-in./cm 58/147.3
Depth-in./cm 36/91.4
Weight-lbs./kg 680/308.4
Compressor 2H.P./9500(BTUH)
1.5kw(Motor)
2.8kw(Cooling)
BeaterMotor 2H.P/1.5 kw
Refrigerant 404a
Charge 3.75lb/1.70kg
Cylinder 4Qts./3.8Liters
*Contactfactoryforothervoltages.
3.1 Particulars
Figure3-1
3.2 Dimensions

5
184662
DUKE Model 957R Soft Serve Freezer
Write in
Reference Informa-
tion HERE!
(
3.3 Data Plate
The data plate provides important information that
the operator should record and have available for
parts ordering, warranty inquiries, and service re-
quests. Fill in the following information below as
soon as you receive the 957R. (The item num-
bers—encircled, below—correspond with the
callout numbers above.)
IMPORTANT: Complete for reference:
1ModelNumber:_______________
2 SerialNumber:_______________
3 Electrical Spec: Voltage ______
Phase_______ Hertz ________
4 MinimumCircuitAmpacity: __________
5 Maximum fusesize: _____________
Installation Date ________________
Installedby______________________
Address________________________
_______________________________
Phone__________________________

6184662
DUKE Model 957R Soft Serve Freezer
4 Part Names and Functions
6 KNOB-HAND
Securestheheadtothefreezing
cylinder.
7 EXTENSION - SPIGOT (Acces-
sory)
Extends the product opening
down to aid in forming and
shaping product.
8 O-RING - HEAD
Seals the head to the freezing
cylinder. Must be lubricated.
9 PLUG-AIR RELIEF
Sealstheairreliefopeninginthe
headwhenclosed.Allowsexcessair
toberemovedfromthecylinder
whenpriming.
10 O-RING-PLUG
Sealstheairreliefplugin thehead.
1 HEAD
Encloses the freezing cylinder and
provides an opening for product to
be dispensed.
NOTE: Beater Motors will not operate with
the head removed from the freezer.
2 SPIGOTASSEMBLY
Sealstheproductopeninginthehead
whenclosed.Allowsproducttoflowwhen
open.
3 O-RING-SPIGOT
Sealsthespigot inthehead. Must be
lubricatedtosealandslideproperly.
4 O-RING - SPIGOT EXTENSION
Holds the extension on to the
spigot.
5 ROD - SPIGOT
Starts the freezer when dispensing.
Must be in place before freezer will
operate.
Figure4-1

7
184662
DUKE Model 957R Soft Serve Freezer
14 SEAL - SHAFT
Sealstheopeningbetweenthefreezing
cylinderandthebeatershaft.Donot
lubricaterubbercupportion.
15 O-RING-SEAL
Sealsthebeatershaft totheshaftseal.
Isinsertedintothesealbushing.Must
belubricated.
16 REMOTEMIXTRANSFER(RMT)
SYSTEMwithShelf(Accessory)
Transfersmixandairfromcoolertothe
freezingcylinder.See(RMTmanual.)
Part Names and Functions (cont’d)
11 SHAFT - BEATER
Rotatesinthefreezingcylinder,blending
airandmixandejectingproduct.
12 BUSHING-CYLINDER
Holds the beater in place at the
front of the cylinder.
13 BLADE - SCRAPER
Scrapesthefrozenproductfromthe
freezingcylinderwall.
16
Figure4-3DukeRemote MixTransferSystem(RMT)
Figure4-2BeaterShaft

8184662
DUKE Model 957R Soft Serve Freezer
5 Operator Controls
A. “CLEAN” (Left Position) - This
position operates the beater only
(no refrigeration). Always use this
position for cleaning and sanitizing
procedures.
B. “OFF” (Center Position) - In this
position the beater motor and
refrigeration system will not oper-
ate.
5.1 Selector Switch 1
C. “AUTO” (Right Position) - This
position activates both the beater
motor and refrigeration unit. This is
the normal operating position.
IMPORTANT:
DO NOT use the AUTO position with
water or sanitizer in the cylinder. The
freezer will be damaged.
Figure 5-1
CAUTION
Test operation of the head
switch prior to placing the
freezer in service. See
Section 11, Routine
Maintenance, Monthly.
The following paragraphs describe the
operator controls and indicators. Refer to
figure 5-1 for location of these controls
and indicators on the freezer.
NOTE: The head must be in place before
the beater will operate.
This three-position switch controls the functions of your freezer.

9
184662
DUKE Model 957R Soft Serve Freezer
5.2 Pump Switch 2
Although this dial thermometer is not
measuring actual product temperature, it
should be observed for its normal oper-
ating reading. It should read 5° to 15°F
This control will bypass the thermostat,
forcing the compressor and beater motor
to run for approximately 3 minutes. Use
the timer for quick start-ups or fast
recovery when dispensing large por-
tions.
This two-position switch controls the operation of the mix pump located in the walk-in
cooler. Pump must be plugged into the receptacle located on the back panel of the
freezer.
A. “ON” (Left Position) - Use this
position to fill the cylinder with mix
or sanitizer when the freezer is in
the normal operating mode and/or
when removing product from the
cylinder.
B. “OFF” (Right Position) - In this
position the pump will not operate.
(-15° to -9°C) when product is being
dispensed at 18°F (-8°C).
5.3 Reset - Overload 3
5.4 Timer 4
5.5 Thermometer 5
IMPORTANT:
Excessive use of the timer causes
freeze-up and damage to the freezer.
Operator Controls (continued)
This control protects the beater motor
against failure from an overload condition
by automatically shutting down the
freezer. To restart properly, turn the
selector switch to the "OFF" position,
wait 2-3 minutes, then depress the red
reset button and turn the selector switch
back to the "AUTO" or "CLEAN" position.
Repeat as needed until beater motor
restarts.
IMPORTANT:
If the overload trips frequently, your
freezer should be checked for proper
product temperature, overrun, and
voltage. Contact H. C. Duke & Son,
Inc. or your authorized service center.

10 184662
DUKE Model 957R Soft Serve Freezer
Important:
Do NOT USE these outlets for any
equipment requiring more than 15
amps. If power for these outlets is
obtained from a neutral and one leg of
power from the freezer, do not use
these outlets for equipment requiring
more than 5 amps.
This is a 115v receptacle provided for mix pumps or spindles.
5.7 Outlet 7
Operator Controls (continued)
A. Amber — this light indicates the
beater motor is operating.
5.6 Pilot Lights 6
B. Red — this light indicates the
compressor is operating.

11
184662
DUKE Model 957R Soft Serve Freezer
CAUTION
Make sure freezer is
depressurized before
proceeding.
SafetyInformation
This freezer uses pressure to assure
consistent product quality. It is important
for your safety that the freezer is depres-
surized slowly and completely whenever
the freezer is to be drained, disas-
sembled, cleaned, or serviced. The
safety instructions in this manual will
remind you when to check to make sure
the freezer is depressurized. When you
see this CAUTION statement
the following steps should be taken:
1. Make sure both pump switches and
both selector switches are in the
“OFF” position.
2. Place a clean bucket under the dis-
pense head.
3. Slowly open the spigots by pulling
right to left each of the dispense
handles, allowing any pressurized
product, cleaning solution, or air to
escape.
4. Open the spigots completely by pulling
handles fully to the left.
Following these steps will assure that the
system is depressurized.
6 Disassembly and Cleaning
CAUTION
To avoid electrical shock or
contact with moving parts,
make sure all switches are
in the “OFF” position and
the main power supply is
disconnected. Some
freezers have more than
one disconnect switch.
It is important that the freezer be
disassembled, washed, lubricated
and sanitized before operation.
The cleaning and sanitizing instructions
explained in this manual are required to
maintain a clean, sanitary freezer. IDQ
requires that the freezer be disas-
sembled, cleaned, reassembled, lubri-
cated and sanitized daily to ensure the
best possible product quality and freezer
operation.
Persons assembling, cleaning, or sanitiz-
ing the freezer must first wash and
sanitize hands and forearms with an
approved sanitizer.

12 184662
DUKE Model 957R Soft Serve Freezer
6.2 Disassembly Instructions
Figure 6-1 Head Assembly (ACCESSORY)
5. Brush, 1/4 inch diameter with 6-1/2
inch handle: used to clean air meter
hose.
6. Lubricant, Lubri-Film: approved
lubricant for moving parts and O-
rings.
7. Kit, O-ring: contains all O-rings and
seals needing replacement on a
regular basis.
8. Sanitizer, Sample: approved sani-
tizer, Stera-Sheen, also available in 4
lb. jar.
6.1 Cleaning Accessories
1. Hose, Spigot Drain: attaches to spigot
for draining product into bucket.
2. Brush, Cylinder, 4 inch diameter with
36 inch handle: used to clean the
cylinder.
3. Brush, 7/16 inch diameter with 12 inch
handle: used to clean transfer hose,
braided hose, and pickup tube.
4. Brush, 9/16 inch diameter with 36 inch
handle: used to clean drain tube.
The following accessories shipped with the freezer are necessary for cleaning,
sanitizing, and disassembly/assembly: